• Species and lower taxa
• Higher taxa
• Common names

Radiella sol – synonym of Trichostemma hemisphaericum

Radiella spinularia – synonym of Spinularia spinularia

Raphiodesma aculeatum – synonym of Biemna variantia

Raphiodesma fallaciosum – synonym of Mycale macilenta

Raphiodesma floreum – synonym of Mycale macilenta

Raphiodesma lingua – synonym of Mycale lingua

Raphiodesma minima – synonym of Mycale minima

Raspaciona aculeata

Raspailia (Syringella) agnata – synonym of Raspailia agnata

Raspailia abyssorum – synonym of Antho dichotoma

Raspailia agnata

Raspailia dichotoma – synonym of Antho dichotoma

Raspailia hispida – synonym of Raspailia hispida

Raspailia hispida

Raspailia howsei – synonym of Raspailia hispida

Raspailia moebii – synonym of Antho dichotoma

Raspailia radiosa

Raspailia rigida – synonym of Stelligera rigida

Raspailia virgultosa

Reniera albescens – synonym of Halichondria panicea

Reniera armatura – synonym of Spanioplon armaturum

Reniera bowerbanki – synonym of Haliclona cinerea

Reniera cinerea – synonym of Haliclona cinerea

Reniera clavata – synonym of Haliclona urceolus

Reniera coccinea – synonym of Halichondria panicea

Reniera crassa – synonym of Haliclona simulans

Reniera crassa – synonym of Petrosia crassa

Reniera densa – synonym of Haliclona simulans

Reniera digitata – synonym of Tedania anhelans

Reniera elegans – synonym of Haliclona cinerea

Reniera fallaciosa – synonym of Halichondria panicea

Reniera fibulata – synonym of Haliclona fibulata

Reniera fistulosa – synonym of Haliclona fistulosa

Reniera fragilis – synonym of Halichondria panicea

Reniera gracilis – synonym of Haliclona oculata

Reniera indefinita – synonym of Haliclona angulata

Reniera indistincta – synonym of Haliclona indistincta

Reniera indistincta – synonym of Haliclona viscosa

Reniera ingalli – synonym of Haliclona simulans

Reniera lactea – synonym of Halichondria panicea

Reniera mcandrewii – synonym of Haliclona fistulosa

Reniera membrana – synonym of Halichondria panicea

Reniera nigrescens – synonym of Tedania anhelans

Reniera palescens – synonym of Axinella infundibuliformis

Reniera paupera – synonym of Esperiopsis fucorum

Reniera peachi – synonym of Haliclona cinerea

Reniera permollis – synonym of Haliclona cinerea

Reniera reticulata – synonym of Halichondria panicea

Reniera simplex – synonym of Haliclona fistulosa

Reniera simplex – synonym of Haliclona urceolus

Reniera simulans – synonym of Haliclona simulans

Reniera thomasii – synonym of Halichondria panicea

Reniera tubulosa – synonym of Oceanapia robusta

Reniera uniformis – synonym of Esperiopsis fucorum

Reniera urceolus – synonym of Haliclona urceolus

Reniera varians – synonym of Haliclona oculata

Reniera vicosa forma similaris – synonym of Haliclona viscosa

Reniera viscosa – synonym of Haliclona viscosa

Reniera voeringii – synonym of Haliclona urceolus

Rhabderemia gallica

Rhabderemia minutula – synonym of Rhabderemia gallica

Rhaphidophlus filifer var. cantabrica – synonym of Clathria barleei

Rhaphidostyla kitchingi – synonym of Hymeniacidon kitchingi

Rhaphidotheca affinis – synonym of Mycale marshallhalli

Rhaphidotheca marshall-halli – synonym of Mycale marshallhalli

Rhaphidotheca rhopalophora – synonym of Mycale marshallhalli

Rhaphiodesma fallaciosum – synonym of Mycale similaris

Rhaphiodesma sordida – synonym of Mycale similaris

Rhaphyrus griffithsii – synonym of Cliona celata

Rhizaxinella elongata

Rinalda uberrima – synonym of Polymastia uberrima

Rotuloplocamia octoradiata